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<script>
//     题目1: 对字符串进行排列组合, 得到所有字符的全排列组合(假设所有字符不重复)
// 函数名：permutation
// 参数：需要排列组合的字符串
// 返回值：字符串的所有排列组合数组
// 例如：permutation("abc") 返回 ["abc", "acb", "bac", "bca", "cab", "cba"]

function permutation(str){
    let arr = str.split('')
    let str2 = null;
    for (let i = 0; i < arr.length; i++) {
        for (let j = 0; j < arr.length; j++) {
            if (arr[i]==arr[j])
            continue;
            let str2 = arr[i]+arr[j]
            console.log(str2);
        }
        
    }

}

  console.log(permutation('abc'));  
</script>